Measurement of dust conversion factor for the JET carbon divertor phases

Jari Likonen; J.P. Coad; Antti Hakola; J. Karhunen; Seppo Koivuranta; R. Pitts; A.M. Widdowson; JET Contributors

doi:10.1016/j.jnucmat.2014.10.066

Measurement of dust conversion factor for the JET carbon divertor phases

Jari Likonen (Corresponding Author), J.P. Coad, Antti Hakola, J. Karhunen, Seppo Koivuranta, R. Pitts, A.M. Widdowson, JET Contributors

Research output: Contribution to journal › Article › Scientific › peer-review

5 Citations (Scopus)

Abstract

We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.

Original language	English
Pages (from-to)	842-846
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.10.066
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

Access to Document

10.1016/j.jnucmat.2014.10.066

Cite this

@article{7253a1534023410c9e081cee1bbdc4a2,

title = "Measurement of dust conversion factor for the JET carbon divertor phases",

abstract = "We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.",

author = "Jari Likonen and J.P. Coad and Antti Hakola and J. Karhunen and Seppo Koivuranta and R. Pitts and A.M. Widdowson and {JET Contributors}",

note = "Project code: 104445 ",

year = "2015",

doi = "10.1016/j.jnucmat.2014.10.066",

language = "English",

volume = "463",

pages = "842--846",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Measurement of dust conversion factor for the JET carbon divertor phases

AU - Likonen, Jari

AU - Coad, J.P.

AU - Hakola, Antti

AU - Karhunen, J.

AU - Koivuranta, Seppo

AU - Pitts, R.

AU - Widdowson, A.M.

AU - JET Contributors

N1 - Project code: 104445

PY - 2015

Y1 - 2015

N2 - We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.

AB - We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.

U2 - 10.1016/j.jnucmat.2014.10.066

DO - 10.1016/j.jnucmat.2014.10.066

M3 - Article

SN - 0022-3115

VL - 463

SP - 842

EP - 846

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Measurement of dust conversion factor for the JET carbon divertor phases

Abstract

Access to Document

Fingerprint

Cite this